Open source Nest implementation

nix: Install and initialize a Postgres DB For a persistance layer, this change introduces postgresql as dependency. The daemon is started when `nix-shell` is invoked. `pg_ctl stop` is not invoked, and this has to be done by a developer. Data is persisted in a tmp directory, which is added to the ignore file.

Created by  zj  on July 15, 2021
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